Which factors are responsible for high and low tides? O A. Cold and warm ocean currents
OB. The moon's gravity and Earth's rotation
O C. The ocean's conveyor belt and refraction
O D. Earthquakes and volcanoes

The soviet union beat the us to the first successful launch, with the october 4, 1957, orbiting of sputnik 1, and later beat the us to have the first human in earth orbit, yuri gagarin, on april 12, 1961. the "race" peaked with the july 20, 1969, us landing of the first humans on the moon with apollo 11